Nuclear fuel assembly with coolant flow fractionation

Details Nuclear fuel assembly with coolant flow fractionation Nuclear fuel assembly with coolant flow fractionation

1988-09-08

1991-03-26

Behrend, Harvey E.

Induced nuclear reactions: processes, systems, and elements

Reactor structures

With particular control rod guide structure

376443, 376444, 376446, 376449, G21C 1500, G21C 332

Patent

active

050027220

ABSTRACT:
A fuel assembly for a light water cooled and moderated nuclear reactor comprises a bundle of fuel rods and a structure for holding the bundle in position comprising upper and lower end pieces or nozzles joined together by guide tubes which support grids for maintaining the fuel rods at the nodal points of a regular array. The upper end piece comprises an adapter plate fixed to some at least of the guide tubes and having an upwardly directed shroud arranged to bear directly or indirectly on the upper core plate of the reactor and encircling a coolant passage defining an internal volume into which all guide tubes open. The adapter plate has coolant passages around the shroud. This arrangement makes it possible to direct an adjustable fraction of the cooling water flow outwardly of a cluster guide sleeve associated with the assembly and belonging to the upper internals of the reactor.

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